AND THEIR INHABITANTS. 217 



The genus Limnaa (Bruguiere) frequents still 

 waters. Some of the species appear transitional with 

 Physa ; some have the shell enveloped by an outer 

 fold or lobe of the mantle. Limncza glutinosa 

 (Miiller) has a dark gray body with a greenish-yellow 

 tinge and light spots ; the tentacles short, triangular 

 with blunt tips. The shell is globosely oval, very 

 thin, transparent horn colour, and highly polished. 

 The variety mucronata has the spire longer, and the 

 shell less globular. L. involuta (Thompson) is 

 oval, yellowish - brown, a thin epidermis, 3 or 4 

 whorls. It inhabits a mountain stream near Killarney. 



LIMNjEA AURICULARIA. 



L. peregra has a yellow gray body with an 

 olive tinge covered with black and light spots. 

 The shell is obliquely ovate, thin, and rather glossy 

 and transparent. It is 075 long and 0-425 broad. 

 The variety Burnetti has the body broader than in 

 the typical form; it is dark-olive, and the mantle 

 nearly black with a few light spots. Lutea has a 

 short spire and 3 or 4 whorls. Lacustris is smaller 

 than Burnetti, but similar. There are several other 

 varieties. L. auricularia is a well-marked species 

 (Linne). L. stagnalis (Linne) has the body fawn or 

 yellowish gray, with a reddish tint covered with 



